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That sludge looks the same I had in my T-stat housing and water pump (802A) when I opened it. It is gelled leak sealer. Apparently my unit had a leak at the hose to radiator connection, and someone filled the unit with leak stop, instead of soldering the radiator inlet pipe. This stuff cleaned...

If it's being bogged down by the generator, it's either mechanical or an electrical overload. I doubt it's mechanical, since you would hear that and most likely see sparks. To rule out a generator internal electrical problems I would disconnect the voltage regulator, and tape off the leads, then...

Thank you for sharing that info. Definitely beats $650 for four from the Gov. supplier. I just ordered some off their site as well. Here is the page that shows the brush (last one on the page). http://www.carbonbrush.com/springloaded3.htm

That's an understatement. I just (4 May) received a quote from Aerobase for 4 (Four) spare brushes. $159.99 ea. 4 for $639.96. Over $600 for four pieces of glorified pencil lead!

Question: You say - when manipulating throttle anything over half throttle it dies out - Are you manually holding the throttle to start the engine? On the 531's, the throttle lever is either on - latched, or off -tripped. Some things to think about: The pegged hertz gage - do you have a way...

More filter parts. I just searched e-bay for a new filter and multiple listings for a filter, bowl and gasket came up, for less than $20 for the set. Search for " New Yanmar Fuel Filter with O-ring & BOWL 104500-55710 ".

Have you tried removing the stainless steel spark arrester on the muffler. If that is plugged it could cause too much backpressure at full throttle. This is the easiest test before you dig into the machine further.

I found a company "Hoye Tractor Parts", that has most of these parts. I just ordered a complete filter unit for one of my MEP-531A's that came without one. They also have a video of how to bleed this system (on a tractor). Kind of messy; At least I put a can under it when I bleed the system...

Glad you got it working. Someone, within the last two weeks posted a vendor for the brushes. There is also a thread with p/n for the brush parts. If I find it I will post the info here. Looks like you got a good unit.

The Volt & Hertz meter on the 531A is upstream of the breaker, so they will read if your generator is making power, even with the breaker off. The diode you mentioned acts as a surge suppressor across the shunt trip coil in the breaker. The breaker shunt trip coil is controlled by the A2 engine...

IN

Have you checked the meter fuse F1? The volt and Hertz meter are before the breaker. If the fuse is good and your meters don't read, then you either have a wiring , VR, or generator problem. I attached the schematic from the manual to help you along. The hour meter is powered from the engine...

They are supposed to be spark arresters for what its worth. I added #10 stainless lock washers between each disk, and eliminated the back pressure problem, while keeping the original "look".

Another option would be Calcium Silicate insulation ( www.industrialinsulation.com/images/calcium_silicate_data_sheet_050517.pdf ). It is harder than mineral wool, but is installed the same way; cut to fit, and secure with wire, then cover with the aluminum jacket. Depending on the length of...

If it is a straight run, you could use preformed mineral wool insulation like this https://www.mcmaster.com/insulation/pipe-insulation-3/mineral-wool-pipe-insulation/ . Otherwise two or three layers of the wrap as recommended by Scoobyshep should work. Just make sure the material is good for...

With the virus going around, I am finding plenty of time to work in my shop, and ran across this test I started on 18 March 2018. This is a final update of my Fernco diesel soak test. These parts have been submerged in diesel for almost 25 month. The final results are the same as in my last...

Are you referring to the drain bushing on the tank? My fuel shutoff is on the fuel filter. The drain bushing is a "well nut" type bushing. I replaced those with a brass bulkhead fitting with a viton "O" ring and pipe plug. (Same size as used on my Mep-802A -...

Search on Amazon for "Electriduct Rubber Grommet Seal Gasket O-Ring Bushing - 3/8" x 1/8" x 1/2" x 5/8" x 13/32" - Pack of 50 Grommets" I copied that description from the site.

I have been using these generic bushings on my 531 and 016D's with good success. They are made by Electriduct, from SBR rubber, and are available on Jeff's big "A" site for about U$D 16. The only difference is that the Yanmar has a slightly larger flange on one side, which does not appear to...

I recently had a leak on my truck engine. Ordered some Tracerline UV dye for oil (they make one for oil and one for coolant), and a cheap UV flashlight off the big "A" site. Amazing how easy it was to find the leak in the dark. Any seepage with the dye will glow brightly. (And so will your...